It is 61% unfavorable. 34% favorable.
From the linked poll results:
Bloomberg Politics Poll conducted by Selzer & Company. Nov. 15-17, 2015. N=1,002 adults nationwide. Margin of error +/- 3.1.
"Now, I'm going to mention some people and groups in the news recently. For each, please tell me if your feelings are very favorable, mostly favorable, mostly unfavorable, or very unfavorable. If you don't know enough to answer, just say so. ... Donald Trump, a businessman from New York."
If he gets > 5% in the Iowa caucus I will be surprised.
Looking at the question, I don't think the "unfavorable" means people won't vote for Mr. Trump. Also, judging by his crowds, the ratings boost whenever he's on TV and the popularity of Apprentice and of his books, I just can't imagine he's at 61% unfavorable.
I'll stand by my suspicion that there are a lot of people who have an "unfavorable" view of Mr. Trump as a person but will vote for him. A better question would be "who has the leadership skills to bring the US through a crisis" or something to that effect. A question such as that would better reflect those who are apt to vote for Mr. Trump.
You really think Trump's going to do poorly? We must live in different universes.